Diamond dressing tool holder



Oct. 11, 1960 H. SCHIEBER DIAMOND DRESSING TOOL HOLDER Filed Aug. 18, 1958 1 I: "u n INVENTOR: HANS SCHIEBER Unite;

tates n,

fiiice.

This invention relates. to. diamond tool holders for truing or dressing the. annular face-of grinding wheels.

The dressing or truing of grinding wheels requires an industrial diamond-mounting so supported in a holder as to permit a very close adjustment of the diamond to the face of the wheel which is to be dressed or trued and to insure a firm locking ofthe mounting in its adjusted relationship to the face of the wheel in order to insure precise results.

The main objects of this invention are to provide an improved form of diamond-dressing tool for grinding wheels; to provide an improved related form of holder and diamond-mounting which permits a close relative adjustment and secure locking of the parts in operative position; to provide an improved form of holder and mounting of this kind with improved means for regu lating the relative positioning of the holder and mounting in relationship to the grinding wheel for efiective dressing thereof; and to provide an improved diamondmounting and holder of. this kind which is especially adapted for use on electro-magnetic tables.

A specific embodiment is shown in the accompanying drawings, in which: t

Figure 1 is a side elevation of an improved grinding wheel dressing-tool constructed in accordance with this invention shown positionedon an electro-magnetic table for eflective truing of a grinding wheel;

Fig. 2 is a perspective view of the tool;

Fig. 3 is a bottom view of the tool; and

Fig. 4 is a vertical, sectional view taken on the plane of the line 44 of Fig. 2. v

The essential concept of this invention involves a cylindrical element having a reduced-diameter annular section intermediate its ends and mounting a diamond at its conical-shaped apex and slidably supported in a holder on a resilient cushion for locking in axially-adjusted relationship in the holder by a set screw radially threaded into the holder to locate its inner end for engaging the reduced annular section of the mounting.

A grinding-wheel dressing-tool embodying the foregoing concept comprises a block or housing 5 formed with a bore 6 for slidably' supporting a diamond mounting element 7 on a resilient cushion 8, for locking the element 7 in adjusted position in the bore 6 and a set screw 9.

The supporting block 5 here shown is of short cylindrical form with the opposite ends 10 and 11 nonparallel, to assure, when properly positioned the conical sides of the industrial diamond 17, is exposed to the grinding wheel instead of the point thereof. Preferably, the upper end 10 of the block 6 has the rim thereof beveled as shown at 12.

The bore 6, in the block 5, comprises two sections 13 and 14 (Fig. 4) of difiering diameters drilled in from the opposite ends 10 and 11, respectively, and joining at 15 substantially medially of the height of the block 5.

The mounting element '7 is an elongated cylindrical member of a diameter closely fitting the section 13 of Patented Oct. 11-, 1960 2, the bore 6 in the blockS. The conical-shaped end '16 seats a conventional industrial diamond 17 known manner. The opposite end 18, of the mounting 17, is flat andv seats on a disk or washer-19 which in turn rests on a resilient or elastic cushion 8." Intermediate its ends 16 and 18, nearly medially, the mounting Tires 21 longitudinally-extending annular section 21 of reduced diameter against which is seated the end 20 of a'set screw 9.

Theelastic cushion 8' is a cylindrical section of rubber, neoprene, or other resilient material normally dimensioned so that in its undistorted condition, it easilysl-id'es into the section 14 of the blockbore 6, with. the inner end-of the cushion approximating the juncture 15 of the two bore sections 13 and 14. This; elastic, cushion 8 is; highly sensitive to pressure so.- that it isfirm; when the least bit compressed and tends quickly to resume its natural condition as the pressure is released. The cushion 8 is held in place in the bore section- 14 by a plate 22 attached to the base 11 of the block 5 by a pair of screws 23.

The set screw 9 is of conventional form, with a knurled head 24, a stem 26 threaded radially into the block 5 near the upper end 10 thereof. So positioned the end 20 of the stem 26 is disposed for contacting the reduceddiameter annular section 21 of the mounting 7;

This improved diamond dressing tool is used in the following manner: 7

Although, for some types of wheel dressing the block 5 might be clamped in a carriage chuck, this unit has been designed primarily for use on a conventional electro-magnetic table such as is illustrated at 27 in Fig. 1. Such table is capable of shifting in a horizontal plane,

' both laterally and transversely.

In this Fig. 1, a grinding wheel 2-8 is shown mounted above the table 27 for rotation counter-clockwise in the direction of the arrows. As is conventional with this type of equipment, the wheel 28 is vertically adjustable with respect to the table 27.

This improved dressing tool is initially positioned on the table 27 substantially between A or 8 in back of the vertical axis of the wheel 28, and the table is magnetized in the usual manner. The mounting 7 is depressed downward against the cushion 8, and locked in position by the set screw 9, then the wheel 28 is shifted downwardlyuntil its periphery and the diamond 17 has a spacing of between and Thereupon the Wheel 28 is locked in position preparatory to starting the dressing operation.

The set screw 3 is then retracted to release the mount ing 7 and allow it to move upwardly to recontact the diamond 17 with the periphery of the wheel 28, whereupon the set screw 9 is re-tightened to seat the end 20 against the reduced annular section 21 of the mounting 7 to hold the mounting rigidly in place in the block 5. Next the wheel is raised between .005" and .010".

All of these parts being thus positioned, the wheel 28 is rotated and the table 27 is reciprocated in the wellunderstood manner with this type of equipment.

When the periphery wheel 28 no longer is cut by the diamond 17, i.e. the diamond no longer contacts the wheel, the table 27 wheel, the set screw 9 unlocks the element 7 and the same is turned slightly. Then the operation hereinabove described is repeated over and over again until the wheel 28 is completely dressed.

It should now be obvious that the element 7 always makes a cushioned contact with the grinding wheel. Likewise the diamond retains a sharpened point at all times and cannot be chipped, cracked and/or broken.

Likewise when the tool holder is removed from the table 27 for storage the set screw 9 is only slightly un-v in the well is moved outwardly away from the turned about A to /2 turn, whereby the element 7 is capable of being reoiprocated in the housing 5, yet the element 7 cannot be withdrawn from the housing because of the shoulders and hence cannot be readily lost. Also ,this releases the tension on the member 8.

Although but one specific embodiment of this invention is herein shown and described it will be understood that details of the construction shown may be altered or omitted without vdeparting from the spirit of the invention as defined by the following claim.

.I claim:

A grinding-wheel dressing-tool comprising, a cylindrical block having a flat base end disposed at an angle to the longitudinal axis of the cylindrical block, the block being formed with axially-alined bores of differing diameters extending axially of the cylindrical block inwardly from opposite ends thereof and joining adjacent the transverse median of the block to form a circular shoulder,

a cylindrical element mounting a diamond on one end thereof slidably supported in the smaller-diameter bore with the inner end of the element extending into the larger-diameter bore, the element having a medial reduced-diameter annular section, a disk plate on the base end of the block closing the larger-diameter bore, a disk of greater diameter than the smaller-diameter bore secured to the inner end of the element to limit the axial movement of the element in the bore by contact of the disk against the circular shoulder, an elastic cushion in the larger-diameter bore seated on the plate and supporting the inner end of the element, and a set screw threaded radially into the block with the inner end positioned to engage the reduced-diameter annular section of the cylindrical element and hold the element in axiallyadjusted position against the cushion.

References Cited in the file of this patent UNITED STATES PATENTS Failla Dec. 13, 1955 

